GCP2.0 Device: mDNS basics

cloud_print/gcp20/prototype/dns_sd.h

Index: cloud_print/gcp20/prototype/dns_sd.h
diff --git a/cloud_print/gcp20/prototype/dns_sd.h b/cloud_print/gcp20/prototype/dns_sd.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d007d4d0225325c01ca95df9ab1fa8e2e7a0575
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+++ b/cloud_print/gcp20/prototype/dns_sd.h
@@ -0,0 +1,81 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GCP20_PROTOTYPE_DNS_SD_H_
+#define GCP20_PROTOTYPE_DNS_SD_H_
+
+#include <vector>
+
+#include "net/udp/udp_socket.h"
+
+// Class for sending multicast announcements, receiving queries and answering on
+// them. Client should call |ProccessMessages| periodically to make server work.

[gene, 2013/06/06 00:13:51]

Add a ProcessMessage() function, make it NOTIMPLEMENTED()?

[maksymb, 2013/06/06 01:52:46]

Done.

+class DnsSd {
+ public:
+  // Constructs unstarted server.
+  DnsSd();
+
+  // Stops server.
+  ~DnsSd();
+
+  // Starts the server. Returns |true| if server works. Also sends
+  // announcement.
+  bool Start();
+
+  // Sends announcement if server works.
+  void Update();
+
+  // Stops server with announcement.
+  void Shutdown();
+
+  // Returns |true| if server works.
+  bool is_online() { return is_online_; }
+
+ private:
+  // Binds a socket to multicast address. Returns |true| on success.
+  bool BindSocket();
+
+  // Sends announcement.
+  void SendAnnouncement(uint32 ttl);
+
+  // Returns |true| if server received some questions.
+  bool CheckPendingQueries();
+
+  // Sets the header of DNS packet after adding all of necessary queries and
+  // answers.
+  void UpdateHeader(bool is_question, std::vector<uint8>* message);
+
+  // Appends answer on SRV query at the end of |message|.
+  void AppendSrv(uint32 ttl, std::vector<uint8>* message);
+
+  // Appends answer on PTR query at the end of |message|.
+  void AppendPtr(uint32 ttl, std::vector<uint8>* message);
+
+  // Appends answer on TXT query at the end of |message|.
+  void AppendTxt(uint32 ttl, std::vector<uint8>* message);
+
+  // Appends answer on A query at the end of |message|.
+  void AppendA(uint32 ttl, std::vector<uint8>* message);
+
+
+  // Stores |true| if server was started.
+  bool is_online_;
+
+  // Stores socket to multicast address.
+  scoped_ptr<net::UDPSocket> socket_;
+
+  // Stores multicast address end point.
+  net::IPEndPoint multicast_address_;
+
+
+  // Stores number of question in current DNS packet.
+  uint16 question_count_;
+
+  // Stores number of answers in current DNS packet.
+  uint16 answers_count_;
+};

[gene, 2013/06/06 00:13:51]

add chrome macro to disable copy contructor

[maksymb, 2013/06/06 01:52:46]

Do you mean DISALLOW_COPY_AND_ASSIGN? Then done.

+
+
+#endif  // GCP20_PROTOTYPE_DNS_SD_H_
+